Wilfred M. Estey practiced law with Torys since 1974 and became a partner in 1980. He practiced corporate/commercial and securities law from 1974 to 1981, in which year he founded the firm's Research and Opinions Group. As a member of that Group, Bill's practice involved conducting legal research, writing and reviewing legal opinions and memoranda, and reviewing and supervising research projects on a wide range of legal issues. He was frequently consulted about difficult legal questions by lawyers in the firm from virtually every practice area and was regularly involved in the structuring of complex corporate and commercial transactions. Bill has written and spoken on various legal opinion matters for the Canadian Bar Association, the Law Society of Ontario, the Canadian Institute, Federated Press and Osgoode Hall Law School. Bill was a member of, and the sole Canadian representative on, the TriBar Opinion Committee in New York. The Committee's influential report on opinions, originally published in 1979, was substantially revised and published in 1998. Bill served as law clerk to the Justices of the Supreme Court of Canada from 1972 to 1973 for Justices Hall and Dickson.